Gas turbine engine component retention

Abstract

A split retaining ring 22 has deep internal scallops 26 which clear lugs 36 during installation while the ring fits within lip 40. The ring is opened with ridges 30 clearing lugs 36 while the ring is rotated. Shallow internal scallops rest on and lock with lugs 36 in the final position.

I claim: 
     
       1. A retention arrangement for axially retaining a static component from downstream movement in a gas turbine engine, comprising: a static housing having a base diameter at an upstream location, a circumferential groove having a groove diameter larger than said base diameter downstream of said base diameter, and   an inwardly extending lip downstream of said groove having an inside intermediate lip diameter;   said static component fitting within said housing and having a rim diameter greater than said base diameter;   axially projecting lugs on said static component, the outer edges of said lugs forming an outside diameter less than said lip diameter;   a split retaining ring having a plurality of deep scallops and a plurality of shallow scallops located on the inside edge of said ring and at least some of said scallops separated by ridges;   said deep scallops spaced to clock with and sized to clear said lugs when said ring is opened to an outside diameter equal to the inside intermediate lip diameter;   said ridges sized to clear the outside diameter formed by said lugs with said ring fitting in said circumferential groove; and   said shallow scallops spaced to clock with and sized to rest on said lugs with the outside diameter of said ring greater than said inside intermediate lip diameter.   
     
     
       2. An arrangement as in claim 1 further comprising: said lugs having square corners at the outside edge of each lug; and   said shallow scallops having square corners at each edge of each shallow scallop.   
     
     
       3. A retention arrangement as in claim 1 further comprising: said deep scallops having a rounded corner at each edge of each deep scallop.   
     
     
       4. A retention arrangement as in claim 2 further comprising: said deep scallops having a rounded comer at each edge of each deep scallop.   
     
     
       5. A retention arrangement as in claim 3 further comprising: said static component having at least one ear extending radially outward and circumferentially interacting with a portion of said static housing, whereby rotation of said static component relative to said static housing is prevented.   
     
     
       6. A retention arrangement for axially retaining a static component from downstream movement in a gas turbine engine, comprising: a static housing having a circumferential groove having a groove diameter, and   an inwardly extending lip downstream of said groove having an inside intermediate lip diameter;   said static component fitting within said housing and having a rim diameter;   axially projecting lugs on said static component, the outer edges of said lugs forming an outside diameter less than said lip diameter;   a split retaining ring having a plurality of deep scallops and a plurality of shallow scallops located on the inside edge of said ring and at least some of said scallops separated by ridges;   said deep scallops spaced to clock with and sized to clear said lugs when said ring is opened to an outside diameter equal to the inside intermediate lip diameter;   said ridges sized to clear the outside diameter formed by said lugs with said ring fitting in said circumferential groove; and   said shallow scallops spaced to clock with and sized to rest on said lugs with the outside diameter of said ring greater than said inside intermediate lip diameter.